Experimental checking of an analytical AC losses model for superconducting twisted cable-in-conduit
In superconducting machines, such as tokamaks for fusion experiments, the coils can be subjected to fast variations in magnetic field. The superconducting conductor has to be designed carefully in order to reduce alternating current (ac) losses to an acceptable level. It is therefore necessary to understand the influence of the design parameters on ac losses. For that purpose, an analytical model for calculating ac losses in twisted cable-in-conduit conductor has been developed. This model takes into account the strand characteristics and the detailed cabling pattern. In order to perform an experimental check, a systematic analysis on subsize-cables, representative of the first three stages of the conductor that is foreseen for the toroidal coils of the international thermonuclear engineering reactor (ITER), has been carried out. These cables have been made from different Nb(3)Sn composites, the other parameters kept as constant as possible, to see the influence of the strand on the cable losses. This study includes ac losses measurements on composites and on sub-size cables, and inter-strand resistance measurements. The losses measurements are cross-checked to the resistance measurements, and the resistance measurements correlated to the strand characteristic.
Bibliographic Reference: Article: Advances in Cryogenic Engineering (1997)
Record Number: 199810158 / Last updated on: 1998-02-12
Original language: en
Available languages: en